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## Standard deviation

en.wikipedia.org/wiki/Standard_deviation

In statistics, the standard deviation is a measure that is used to quantify the amount of variation or dispersion of a set of data values. A low standard deviation  ...

## Standard Deviation and Variance - Math is Fun

www.mathsisfun.com/data/standard-deviation.html

The Standard Deviation is a measure of how spread out numbers are. Its symbol is σ (the greek letter sigma). The formula is easy: it is the square root of the ...

## Standard Deviation - Robert Niles

www.robertniles.com/stats/stdev.shtml

A simpler explanation of standard deviation, written by a former math-major- turned-journalist who likes to explain math to people don't understand or just plain ...

## Standard Deviation Definition | Investopedia

www.investopedia.com/terms/s/standarddeviation.asp

1. A measure of the dispersion of a set of data from its mean. The more spread apart the data, the higher the deviation. Standard deviation is calculated as the ...

## Standard Deviation Calculator - Calculate Mean, Variance of the ...

www.easycalculation.com/statistics/standard-deviation.php

Standard Deviation (SD) is the measure of spread of the numbers in a set of data from its mean value. It is also called as SD and is represented using the symbol ...

## Standard deviation | Sample variance and standard deviation | Khan ...

Learn how to calculate standard deviation, how it relates to variance and mean, and the difference between population and sample standard deviation.

## Calculating standard deviation step by step | Summarizing spread of ...

Interestingly, in the real world no statistician would ever calculate standard deviation by hand. The calculations involved are somewhat complex, and the risk of ...

## Standard Deviation | How and when to use the Sample and ...

A guide on the standard deviation including when and how to use the standard deviation and examples of its use.

## Standard Deviation -- from Wolfram MathWorld

mathworld.wolfram.com/StandardDeviation.html

Physical scientists often use the term root-mean-square as a synonym for standard deviation when they refer to the square root of the mean squared deviation of ...

## Formulae for the standard deviation

libweb.surrey.ac.uk/library/skills/Number Skills Leicester/page_19.htm

Whilst it is not necessary to learn the formula for calculating the standard deviation, there may be times when you wish to include it in a report or dissertation.